89 lines
5.8 KiB
HTML
89 lines
5.8 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="SQL server mode and thread-scoped transactions for commitment control" />
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<meta name="abstract" content="Commitment definitions with job-scoped locks are normally scoped to an activation group." />
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<title>SQL server mode and thread-scoped transactions for commitment control</title>
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</head>
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<body id="rzakjthreadscoped"><a name="rzakjthreadscoped"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">SQL server mode and thread-scoped transactions for commitment control</h1>
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<div><p>Commitment definitions with job-scoped locks are normally scoped
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to an activation group.</p>
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<p>If a job is multithreaded, all threads in the job
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have access to the commitment definition and changes made for a particular
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transaction can be spread across multiple threads. That is, all threads whose
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programs run in the same activation group participate in a single transaction.</p>
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<p>There are cases where it is desirable for transactional work to be scoped
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to the thread, rather than an activation group. In other words, each thread
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has its own commitment definition and transactional work for each commitment
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definition is independent of work performed in other threads.</p>
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<p>This is supported by DB2 Universal Database™ (UDB) for iSeries™ by
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using the Change Job (QWTCHGJB) API to change the job to run in SQL server
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mode. When an SQL connection is requested in SQL server mode, it is routed
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to a separate job. All subsequent SQL operations that are performed for that
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connection are also routed to that job. When the connection is made, completion
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message SQL7908 is sent to the SQL server mode job's job log indicating which
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job the SQL requests are being routed to. The commitment definition is owned
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by the job that is indicated in this message. If errors occur, it might be
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necessary to look at the job logs for both jobs to understand the source of
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the problem because no real work is being done in the job performing the SQL
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statements.</p>
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<p>When running in SQL server mode, only SQL interfaces can be used to perform
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work under commitment control. Embedded SQL or Call Level Interface (CLI)
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can be used. All connections made through embedded SQL in a single thread
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are routed to the same back-end job. This allows a single commit request to
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commit the work for all the connections, just as it can be in a job that is
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not running in SQL server mode. Each connection made through the CLI is routed
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to a separate job. The CLI requires work that is performed for each connection
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to be committed or rolled back independently.</p>
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<p>You cannot perform the following operations under commitment control when
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running in SQL server mode:</p>
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<ul><li>Record changes that are made with interfaces that are not SQL interfaces</li>
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<li>Changes to DDM files</li>
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<li>Changes to API commitment resources</li>
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</ul>
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<p>You cannot start commitment control directly in a job running in SQL server
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mode.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakjconcepts.htm" title="This topic provides information to help you understand how commitment control works, how it interacts with your system, and how it interacts with other systems in your network.">Commitment control concepts</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzakjxatransaction.htm" title="DB2 Universal Database (UDB) for iSeries can participate in X/Open global transactions.">XA transaction support for commitment control</a></div>
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<div><a href="../cli/rzadpsqlapd.htm">Run DB2 UDB CLI in server mode</a></div>
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<div><a href="../cli/rzadpstartingservermode.htm">Start DB2 CLI in SQL Server Mode</a></div>
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<div><a href="../cli/rzadprestrictions.htm">Restrictions for running DB2 UDB CLI in server mode</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../apis/qwtchgjb.htm">Change Job (QWTCHGJB) API</a></div>
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</div>
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</div>
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</body>
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</html> |